Insulator



UNITED STATES cYRUs A. PETERSON, OF

PATENT OFFICE.

STRATTON, NEBRASKA.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 557,600,dated April 7, 1896.

Application filed November 11, 1891, Serial No 411,572. (No model.)

To ctZZ whom it may concern:

Be it known that I, CYRUS A. PETERSON, a citizen of the United States, residing at Stratton, in the county of Hitchcock, State of Nebraska, have invented certain new and useful Improvements in Insulators, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to insulators for telegraph-wires and other conductors of electricity; and the object of my improvement is to provide simple and inexpensive means for connecting the glass, or other material, insulators with their support, which means are adapted to have a certain amount of vertical and lateral resilience to permit the connecting means to fit the screw-threaded opening of insulators, said opening varying in size, owing to the different shrinkage in the cooling of the glass and to imperfections in f0rming it. I attain this object by the construction illustrated in the accompanying drawings, in which Figure 1 is a vertical section of an insulator provided with a metal support and connecting means constructed in accordance with my invention. Fig. 2 is a perspective view of the metal support, having its lower end screwthreaded. Fig. 3 is a perspective view of the metal support, having its lower end pointed in the form of a spike. Fig. 4 is a side view of a spring coil of wire adapted to be used with the support shown in Figs. 1 and 2. Fig. 5 is a side view of a spring coil of wire to be used with the spike-support shown in Fig. 3.

In said drawings, A represents the insulator, made of glass and of the usual form, provided with a central perforation having screw-threads a molded therein. The support consists of a screw or spike rod B, having its lower end preferably screw-threaded at b and its upper end b preferably square to receive a wrench and be easily rotated thereby and to have its edges equidistant from the resilient means that secure it to the insulator. Said means consist of a spiral coil of wire D, the diameter of which substantially corresponds with the interior of the screw-threads a, molded in the insulator A. The spaces between the coils d of the wire correspond also with the pitch of the threads (6, so as to fit closely therein.

To retain the spiral coil D permanently con nected to the support B and its coils at the proper distance apart, the ends of the wire are firmly attached to the square upper portions of its support, either by passing its ends d Figs. 1 and 4:, through perforation b in said support and clenching them, or by tightly wrapping the last upper and lower coils 61 around the notched portion 19 Fig. 3, of the spike, (shown barbed on its lower end 5 In either case the distance between the perforation 12 b or the notches Z9 Z7 is predetermined, so as to obtain the proper distance between the spirals of the coil D, and said distance is the same as that formed between the threads molded in the interior of the insulator. By this construction a substantially indestructible metallic support and attachment is obtained for the insulator, but said attachment or connection possesses also a certain amount of both vertical and lateral resilience, which permits it to slightly change its form under the effect of varying temperatures without subjecting the glass of the insulator to any dangerous internal pressure.

Having now fully described my invention, I claim- 1. In combination with a non-conducting insulator having a screw-threaded perforation therein, and a metal rod pointed at one end, a spiral coil of wire secured to the opposite end of said rod and retained in engagement with the screw-threaded insulator, substantially as described.

2. The combination of a non-conducting insulator having a screw-threaded perforation therein, a metal rod pointed at one end and having perforations transversely through its opposite end,with a spiral coil of wire mounted on said rod and having its ends passing through said perforations and retained in engagement with the screw-threaded insulator, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CYRUS A. PETERSON.

Witnesses C. Q. M. FRENCH, T. E. LoMoEAN 

